Raw rabha remvura silikoni rabha rinowanzova vinyl-terinated polydimethylsiloxane, uye chimiro chayo chemorekuru ndochinotevera:
n inomiririra dhigirii yekubatanidza, kazhinji kubva ku150 kusvika ku2000. Inowanikwa kuburikidza necatalytic equilibrium polymerization yeD uye 1, 3-divinyl-1,1,3, 3-tetramethyldisiloxane.
Kupisa kwemvura silikoni rabha kunowanikwa kuburikidza necatalytic silane kuwedzera kwemethyl vinyl raw rabha nehydrogen-ine silicone oiri crosslinking agent ine angaite mapoka matatu e silane kana kupfuura. Kuti tiwane kurapa kwakanyanya, chiyero chemolar chemapoka esilicon kumapoka evinyl chinowanzoita 1.5 kusvika 2. Liquid silicone rabha irabha mbiri-ine musanganiswa reshiyo ye1:1. Component A ine silicone mbishi rabha, mafiller, catalysts uye inhibitors, nepo Chikamu B chine silicone raw rabha, mafirita, crosslinking agents uye inhibitors. Marabha akawanda esilicone anoshandisa platinum complexes inonyatsoshanda Pt(0)·1.5[CH=CH(CH:)zSi]zOKarsted catalyst) uye P(0)·1.5[CH=CH(CH:)Si0](Oshby{15}}Karsted catalyst) secatalyst. Zviri mukati meplatinamu zviri pakati pe(5 kusvika 10)x10 ⁻. Kuve nechokwadi chekuti liquid silicone rabha ine imwe nguva yekuchengetedza yakagadzikana uye inodzora yayo vulcanization nguva, inhibitors zvinhu zvakakosha. Mazhinji unsaturated organic compounds anogona kushandiswa sevulcanization inhibitors ye liquid silicone rabha, yakaita se maleate esters, fumarate esters, alkyne compounds se butynediester, 3-methyl{35}}1{36}butyne-3-doro, 1-acetylil,cyclohexa 3-phenyl-1-butyne-3-doro, 3, 5-propyl-1-octyne-3-doro, etc. Kunewo nitrogen-containing, phosphorus-containing uye sulfur-containing compounds zvakadai se azodicarbonyl uye triazolinedione derivatives, amines, phosphates, phosphites, etc.
Zvaitendwa kare kuti ma inhibitors anodzvanya silicon{{0}hydrogen reaction by complexing metals, uye pasi pe sulfidation conditions, anogona kuburitsa macatalyst anoshanda. Zvidzidzo zvenguva pfupi yapfuura zvakaratidza kuti ese anoshandiswa inhibitors parizvino haadzvanyiriri kuita kwesulfidation nekuomesa simbi, asi panzvimbo pezvo anokonzeresa kupatsanurwa kwechikamu uye kugadzira microdroplets kuparadzanisa catalyst kubva kune substrate.
Kune yemvura silicone rabha, iyo catalyst inowedzerwa kuChikamu A, nepo ese ari maviri Chikamu B aine inhibitors. Chinokosha ndechekuti zviri mukati meiyo catalyst uye inhibitor inofanirwa kuve nechokwadi chekuti mvura silicone rabha ine inenge isina vulcanization reaction pakamuri tembiricha, asi vulcanization kumhanya inokurumidza zvakanyanya pakupisa kwakanyanya. Iyi mifananidzo miviri inotevera inoratidza vulcanization maitiro eyakajairwa mvura silicone rabha pane tembiricha dzakasiyana. Zvinogona kuonekwa kuti mushure mekunge zvikamu A uye B zvasanganiswa pakupisa kwekamuri, zvinotora maawa 70 kusvika ku100 kuti chidimbu chikuru chevulcanization chiitike. Pa -20 dhigirii, inogona kutariswa kuti hapana zviratidzo zve sulfidation reaction. Pa 180 degree, iyo vulcanization reaction inogona kupedzwa mukati memakumi emasekonzi.
Kana mapoka ese e silanol ari pamusoro pe silica inoshandiswa sesimbi inosimbisa kuzadza akatsiviwa nemapoka e-trilkkylsiloxy, kukora kwaanoita pasilicone raw rabha kuchapera simba zvakanyanya. Naizvozvo, rudzi urwu rwesilica runogona kushandiswa kusimbisa mvura silicone rabha. Pamusoro pezvo, mapoka evinyl anogona kuwedzerwa kumapoka ekugadzirisa pamusoro pesilica, zvakadai se1, 3-divinyl-1,1,3, 3-tetramethyldisilazane kuti igadziriswe. Vinyl-ine silica inogona kuwedzera kuwedzera kwayo 125 yekusimbisa mhedzisiro nekutora chikamu mukuyambuka-inobatanidza maitiro.
Uye zvakare, MQ silicone resin inowanzo shandiswa pakusimbisa mune yemvura silicone rubha. MQ silicone resin is organosilicon resin inoumbwa ne single-functional M units (RgSiO.5) uye ina-functional Q units (SiO4x0.s). Mukati memorekuru waro ikeji{7}}sezvakaita inorganic sio2 chimiro, ukuwo yekunze layer yakakomberedzwa nemapoka eorganic. Iyo molecular huremu hweMQ silicone resin inogona kugadziridzwa neiyo molar chiyero cheM kusvika Q chetani zvikamu. Kuwanda kweQ-mayunitsi akabatana, ndiko kukura kunoita huremu hwema molecular, asi kunyungudika kwahwo muorganic solvents kana silicone rabha kunozonyanya kuderera. Kushandisa resin iyi sereinforcing filler yekuwedzera{{13}cured liquid silicone rabha haingove nekusimbaradza, asiwo inoita kuti musanganiswa werabha uve nekuyerera kwakanaka uye kujeka kwakanakisa, zvichiita kuti inyatsokodzera kugadzira zvinhu zvekubikisa, nezvimwewo. MaMQ silicone resin anoshandiswa kuwedzera{15}}akapodzwa mapoka silikoni erabha anosanganisira ayo ane vinyl{silicone mapoka e1 anosanganisira ayo} Aya mapoka anoshanda anowanzo verengera 2.5% kusvika 10% (molar chikamu) chehuwandu hwese organic mapoka.
Nzira dzekugadzirira dzeMQ silicone resin dzakakamurwa kuita marudzi maviri: nzira yegirazi yemvura uye nzira yesilicate. Nzira mbiri idzi dzine zvadzakanakira nezvadzinoipira. Nzira yegirazi remvura inosanganisira kuita kwe organodisiloxane inoumbwa nesingle-silicon inoshanda-oxygen units ine aqueous solution of silicates (water glass) in alkyd medium (Equation 6.5). Iyi nzira ine maitiro akareruka, mutengo wakaderera uye iri nyore kugadzira resin ine yakaderera M/Q ratio.
Iyo silicate nzira ndeyekuigadzirira ne equilibrium reaction ye organodisiloxane uye tetrafunctional orthosilicate mune alkyd medium. Iyi nzira ine maitiro ekudzora nyore kweM/Q reshiyo uye yakamanikana mamorekuru uremu kugovera.
